TETRA channel simulation for automatic speech recognition
The problem of deterioated automatic speech recognition performance for telecommunication devices like mobile phones is well-studied. However, few papers analyse the influence of emergency broadcast radio devices such as the Terrestrial Trunked Radio (TETRA), which is used for many public safety networks in Europe and Asia. In this paper, we dissect several aspects of the TETRA encoding scheme when transmitting over a dedicated emergency radio station by conducting experiments with original hardware and corresponding software simulations. We also offer a new technique for a cepstral mismatch compensation.